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-rw-r--r--lisp/filecache.el2
1 files changed, 1 insertions, 1 deletions
diff --git a/lisp/filecache.el b/lisp/filecache.el
index 3f37839424f..86d5e65df06 100644
--- a/lisp/filecache.el
+++ b/lisp/filecache.el
@@ -213,7 +213,7 @@ Defaults to the value of `case-fold-search'."
:type 'boolean)
(defcustom file-cache-ignore-case
- (memq system-type '(ms-dos windows-nt cygwin))
+ (not (not (memq system-type '(ms-dos windows-nt cygwin))))
"Non-nil means ignore case when checking completions in the file cache.
Defaults to nil on DOS and Windows, and t on other systems."
:type 'boolean)